Text item:
The discussion so far is all based on the assumption that the protocols
that want to be enhanced with TLS/SSL all have current port assignments
below 1024.
We are working on securing H.323 (A/V Conferencing) with TLS/SSL, and
will need port assignments for the SSL-enhanced protocol(s), but I
expect them to be Registered Ports above 1024.
BTW (as per my previous posting on the subject), the same port can be
used for secure & non-secure versions of a protocol as long as:
a) there is a negotiation/discovery mechansim outside the protocol to
determine the use of security, or
b) the implementation can deterministically differentiate any
application message from the ClientHandshake message.
Method b) is fraught with difficulty, including the fact that the
application will be at the mercy of how the Operating System implements
TLS/SSL, since there would have to be collusion between the two when the
application detects the ClientHello (or the TLS/SSL layer does not
detects ClientHello - depending on who sees the message first).
An Operating System may not be willing to trust the implied assertion by
an application that its protocol can be differentiated....who knows
where a false assertion would take it....
John
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Subject: Moving Forward with Regularizing Port Numbers
From: Christopher Allen <ChristopherA@consensus.com>
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Date: Thu, 6 Feb 1997 03:36:53 -0800
Organization: Consensus Development Corporation <http://www.consensus.com/>
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